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Robert Cohen asks, "Isn't 1 ml equivalent to 1 cm^3? Isn't g/ml
equivalent to g/cm^3?"
I think it depends upon whom you ask. Now that we have a meter (and
from that, centimeter) defined by light, it turns out that 1 cm^3 of
water, at water's maximum density (at 3.98 Celsius) is not exactly one;
rather, it is 0.999972 g/cm^3. Therefore, water never gets more dense
than this, i.e. it never reaches exactly one.